Added an option to control legend sort order.
Added an option to control legend sort order.

Added a legend 'sorted' option that allows sorting of legend entries
independent of series order.  It accepts either null/false, true,
'ascending', 'descending' or a comparator function.

MAMISHO/flot,cipix2000/flot,colinhunt/flot,k-joseph/flot,stanislavdavid/flot,k-joseph/flot,chiu/flot,cipix2000/flot,soenter/flot,ni-kismet/engineering-flot,soenter/flot,lolifans/flot,pepperdata/flot,fashionsun/flot,matong/flot,wet-boew/flot,sedran/flot,andig/flot,mlitwiniuk/flot,wet-boew/flot,Sensirion/flot,andig/flot,TrainingPeaks/flot,chaveiro/flot,trask/flot,chiu/flot,Ninir/flot,klarkc/flot,mcanthony/flot,chaveiro/flot,mlitwiniuk/flot,stanislavdavid/flot,resnick1223/flot,chaveiro/flot,andig/flot,saike/flot,saike/flot,resnick1223/flot,octavianCraciun/engineering-flot,mlitwiniuk/flot,magora-suchkov/flot,Ninir/flot,saike/flot,gdseller/flot,petrvacha/flot,stanislavdavid/flot,chiu/flot,flot/flot,k-joseph/flot,kongx73/flot,resnick1223/flot,cipix2000/engineering-flot